CONSTANT FLOW VALVE HAVING CHECK MECHANISM

PROBLEM TO BE SOLVED: To integrally form a check valve and a constant flow valve by constituting a constant flow valve having a check mechanism of a valve main body to form a fluid inlet and a valve chest, a valve element to form a freely deformable passage, a holding means to hold this element and a cover member to form a fluid outlet. SOLUTION: A valve element 8 curves with a contact point with a pipe as a fulcrum by supply pressure of raw water flowed in from a fluid inlet 2. A space part is generated between a valve seat 4 and a valve element 8 by curving, and a clearance is also generated between an inner peripheral wall of a valve chest 3 and an outer peripheral wall of the vale element 8. The raw water flows out of a fluid outlet 10 through a passage 6 and a water passing passage 7 from this clearance. When raw water supply pressure increases, since a curving rate of the valve element 8 becomes large, the passage 6 flattens to adjust a flow rate of the raw water. The raw water of a constant flow rate can be supplied even when the raw water supply pressure changes since the valve body 8 curves in response to the raw water supply pressure. When the raw water stops, the valve element 8 is restored, and blocks up the fluid inlet 2 to check a counterflow.